Clever and Useful: A Review of the Canon Drop-In Filter EF-to-RF Adapter
One of Canon's niftiest new gadgets is the EF-to-RF mount adapter that can accept both variable ND and circular polarizing filters, allowing you to use them with any EF lens without having to worry about individual filter size, making it useful for a wide range of situations. This great video review takes a look at the adapter and how it performs in practice.